While that might be true, 99% of the views are a very small subset of the videos posted. It's completely doable, or at the very least the problem can be greatly mitigated by putting more humans into the process and not letting the algos recommend videos that haven't been viewed by someone in Youtube's equivalent of "standards and practices". All that being said, I fear the primary reason this is not done is because such actions would reduce the number of hours of viewed videos and ad revenues. In fact, I've read articles supporting this theory.
Google under Pichai is basically like Exxon under Lee Raymond--solely focused on revenue growth and completely blind to any number that doesn't show up on the current and next quarter's income statement.